Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (0, 1, -1), (0, 1, 1), (1, -1, -1)}.
A148602
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (0, 1, -1), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =58a(6) =193a(7) =632a(8) =2283a(9) =8009a(10) =29503a(11) =109608a(12) =417840a(13) =1593676a(14) =6201714a(15) =24352821a(16) =96549718a(17) =384965234a(18) =1551154581a(19) =6289703937a(20) =25643105136a(21) =105131398752a(22) =433780213485
External references
- oeis: A148602